*{
  margin: 0;
  padding: 0;
}
.app {
  height: 100vh;
  display: flex;
  flex-direction: column;
}
.top {
  flex: 0;
  border-top: solid 1px var(--adm-color-border);
}
.body {
  flex: 1;
  display: flex;
  
}

.bottom {
  flex: 0;
  border-top: solid 1px var(--adm-color-border);
}
.container {
  width: 100vw;
  height: 100vh;
  display: flex;
  overflow: hidden;
}
.main {
  flex: 1;
  overflow: auto;
}
.lou {
  height: 900px;
}
#F0{
  background-color: red;
}
#F1{
  background-color: green;
}
#F2{
  background-color: blue;
}